If you want to build an amplifier using a tetrode but don't want to mess around with screen and grid powersupplies this one is for you!HV and filament voltage required, just as in a grounded grid amplifier. Screen voltage is derived from the input RF and the grid is at DC ground.Check the circuit description below.

The HF station, amplifier rack to the right The QBL 5-3500 tube

Top of the rack is a small homebrew 4CX350A amp for 144 MHz, below that is my homebrew HF amp described below.